The presence of the tiny neutrino masses and mixings between different neutrino flavors have been established by many neutrino oscillation experiments [1]}, [2]}, [3]}, [4]}, [5]}, [6]}, [7]}, while more and more evidences are accumulated for the existence of dark matter (DM) over the last several decades, with the most precise measurement of its relic abundance by PLANCK [8]}, [9]}. Both phenomena cannot be explained within the Standard Model (SM), thus providing us with two windows towards new physics beyond it. An interesting idea is to connect neutrinos and DM in a unified framework as many existing attempts in the literature (see e.g. Refs.  [10]}, [11]}, [12]}, [13]}). We would like to push this connection further in the present paper.
